Due to the ongoing uncertainty with international travel restrictions, the Scientific Committee have taken the difficult decision to cancel the IWHOD meeting, which was scheduled to take place in Seville, Spain 25th - 27th March 2021.  The plan is to delay the 2021 Workshop to 2022 so, please can we request you to keep these dates for your diaries - 24th to 26th March 2022 in Seville, Spain. 

To keep the IWHOD spirit alive, we are launching a series of webinars in 2020 and throughout 2021.  The second webinar, in the form of Dragons’ Den, will be held on 14 January 2021 from 15 hrs – 16 hrs UK time.  Facilitating discussion will be Professor Caroline Sabin and Dr Keri Althoff and excellent speakers Christopher Rentsch and Michael Traegar will be presenting as below based on the work done following methodological discussions at the last Dragons’ Den session at IWHOD 2019. 

  • Comparing methods to investigate interactions between alcohol and neurocognitively-acting medications on the risk of health outcomes (C.Rentsch).
  • Effect of PrEP initiation on STI incidence among gay and bisexual men: Exploring the utility of a target trial approach using surveillance data (M.Traegar).

Attendance is free but registration is mandatory.  Further details on registration are to follow.

We look forward to you joining us!

October 2020 webinar information:

Chairs: Professor Marina Klein and Professor Stanislas Pol (IWHOD Scientific Committee members).

Speakers and presentation titles:

  1. Daniela van Santen: Estimating trends in hepatitis C incidence among individuals attending primary care clinics that specialise in the care of people who inject drugs in Australia between 2009 and 2018.
  2. Andreea Adelina Artenie: Diversity of detention patterns among people who inject drugs and the associated risk with incident hepatitis C virus (HCV) infection: Implications for hepatitis C prevention.
  3. Mathieu Chalouni: HIV co-infection direct and indirect effect on the risk of non-liver-related cancers in HCV infected participants treated by DAA.


The International Workshop on HIV and Hepatitis Observational Databases (IWHOD) brings senior and junior HIV and hepatitis observational database researchers together to advance the methodology and analysis of observational data. No other workshop or conference devotes attention to the methodology of setting up and analyzing observational data, despite their importance in providing critical information on population outcome in real world settings outside the controlled setting of randomized trials. We are once again aiming to include attendees representing cohort studies from all regions. As in the past, we encourage discussion of work in progress, so all data presented will not be publicised outside of the Workshop.